I am not able to find the right technical term to mention child or instance of a template.
What's the right one, child or instance or something else I am not aware of?
Sorry for my unclear original question.
Its not related to any language. The Template I am talking about is a business concept in my application.
Say for example, I have a "chair" template. I would set a few property values to it to create it's usable instances.
I need this for naming and documentation stuff.
Shortlisted 3 terms: Instance, Definition, Child. Whats suits better?

It's hard to understand what template means in this context but in one conceptual interpretation of the word an instance of a template could be considered a prototype, or perhaps archetype, blueprint, definition